ST. AUGUSTINE, Fla. -- A 20-year-old is behind bars for allegedly activating illegal police lights on his car while behind an officer.

Matthew Michael Lee McMahon, 20, was spotted by a detective in an unmarked with the St. Johns County Sheriff's Office while Monday driving on International Golf Parkway at 8:35 p.m., according to the St. Johns County Sheriff's Office. When the Det. Chance Anderson passed McMahon, McMahon allegedly activated a red and blue light bar on his 1999 Ford Crown Victoria Police Interceptor.

"I pulled over to confront the individual. At which point, he pulled up next to me. Kind of gave me the 'slow down' look and pointed this finger at me," Anderson told FCN.

The detective pulled over on the shoulder of the road and McMahon drove away. The SJSO detective conducted a traffic stop on McMahon, who allegedly provided numerous spontaneous statements on the roadside as to why he was in possession of emergency lights.

"I was shocked to, number one, see somebody affecting a traffic stop on me," Detective Chance Anderson said. "We are a rather large department, but I still know a majority of our law enforcement officers."

Detectives continued the investigation and determined McMahon has never been a certified law enforcement officer.

Anderson told FCN he has been on the force for 10 years and has never seen anything like this. The ironic thing? Detective Anderson's work includes catching police impersonators.

McMahon has also been charged with unlawfully displaying blue lights. He is currently being held in the St. Johns County Detention Facility on bonds totaling $5,500.